#include<stdio.h>
#include<pthread.h>

void cleanup(void *arg)
{
    printf("cleanup: %s\n", (char *)arg);
}

void *thr_fn1(void *arg)
{
    printf("thread 1 start\n");
    pthread_cleanup_push(cleanup, "thread 1 first handler");
    pthread_cleanup_push(cleanup, "thread 1 second handler");
    printf("thread 1 push complete\n");
    if(arg)
        return ((void *)1);
    pthread_cleanup_pop(0); 
    pthread_cleanup_pop(0); 
    return ((void *)1);
}

void *thr_fn2(void *arg)
{
    printf("thread 2 start\n");
    pthread_cleanup_push(cleanup, "thread 2 first handler");
    pthread_cleanup_push(cleanup, "thread 2 second handler");
    printf("thread 2 push complete\n");
    if(arg)
        pthread_exit((void *)2);
    pthread_cleanup_pop(0);
    pthread_cleanup_pop(0);
    pthread_exit((void *)2);
}

int main()
{
    int err;
    pthread_t tid1, tid2;
    void *tret;

    err = pthread_create(&tid1, NULL, thr_fn1, (void *)1);
    if(err != 0)
        printf("can't create thread 1");
    err = pthread_create(&tid2, NULL, thr_fn2, (void *)1);
    if(err != 0)
        printf("can't create thread 2");
    err = pthread_join(tid1, &tret);
    if(err != 0)
        printf("can't join with thread 1");
    printf("thread 1 exit code %ld\n",(long)tret);
    err = pthread_join(tid2, &tret);
    if(err != 0)
        printf("can't join with thread 2");
    printf("thread 2 exit code %ld\n", (long)tret);
    return 0;
}


